1/* 2 * Copyright (c) 2004 Roman Shaposhnik 3 * 4 * Many thanks to Steven M. Schultz for providing clever ideas and 5 * to Michael Niedermayer <michaelni@gmx.at> for writing initial 6 * implementation. 7 * 8 * This file is part of FFmpeg. 9 * 10 * FFmpeg is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * FFmpeg is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with FFmpeg; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24#include <pthread.h> 25 26#include "avcodec.h" 27 28typedef int (action_func)(AVCodecContext *c, void *arg); 29typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr); 30 31typedef struct ThreadContext { 32 pthread_t *workers; 33 action_func *func; 34 action_func2 *func2; 35 void *args; 36 int *rets; 37 int rets_count; 38 int job_count; 39 int job_size; 40 41 pthread_cond_t last_job_cond; 42 pthread_cond_t current_job_cond; 43 pthread_mutex_t current_job_lock; 44 int current_job; 45 int done; 46} ThreadContext; 47 48static void* attribute_align_arg worker(void *v) 49{ 50 AVCodecContext *avctx = v; 51 ThreadContext *c = avctx->thread_opaque; 52 int our_job = c->job_count; 53 int thread_count = avctx->thread_count; 54 int self_id; 55 56 pthread_mutex_lock(&c->current_job_lock); 57 self_id = c->current_job++; 58 for (;;){ 59 while (our_job >= c->job_count) { 60 if (c->current_job == thread_count + c->job_count) 61 pthread_cond_signal(&c->last_job_cond); 62 63 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock); 64 our_job = self_id; 65 66 if (c->done) { 67 pthread_mutex_unlock(&c->current_job_lock); 68 return NULL; 69 } 70 } 71 pthread_mutex_unlock(&c->current_job_lock); 72 73 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size): 74 c->func2(avctx, c->args, our_job, self_id); 75 76 pthread_mutex_lock(&c->current_job_lock); 77 our_job = c->current_job++; 78 } 79} 80 81static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count) 82{ 83 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock); 84 pthread_mutex_unlock(&c->current_job_lock); 85} 86 87void avcodec_thread_free(AVCodecContext *avctx) 88{ 89 ThreadContext *c = avctx->thread_opaque; 90 int i; 91 92 pthread_mutex_lock(&c->current_job_lock); 93 c->done = 1; 94 pthread_cond_broadcast(&c->current_job_cond); 95 pthread_mutex_unlock(&c->current_job_lock); 96 97 for (i=0; i<avctx->thread_count; i++) 98 pthread_join(c->workers[i], NULL); 99 100 pthread_mutex_destroy(&c->current_job_lock); 101 pthread_cond_destroy(&c->current_job_cond); 102 pthread_cond_destroy(&c->last_job_cond); 103 av_free(c->workers); 104 av_freep(&avctx->thread_opaque); 105} 106 107static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size) 108{ 109 ThreadContext *c= avctx->thread_opaque; 110 int dummy_ret; 111 112 if (job_count <= 0) 113 return 0; 114 115 pthread_mutex_lock(&c->current_job_lock); 116 117 c->current_job = avctx->thread_count; 118 c->job_count = job_count; 119 c->job_size = job_size; 120 c->args = arg; 121 c->func = func; 122 if (ret) { 123 c->rets = ret; 124 c->rets_count = job_count; 125 } else { 126 c->rets = &dummy_ret; 127 c->rets_count = 1; 128 } 129 pthread_cond_broadcast(&c->current_job_cond); 130 131 avcodec_thread_park_workers(c, avctx->thread_count); 132 133 return 0; 134} 135 136static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count) 137{ 138 ThreadContext *c= avctx->thread_opaque; 139 c->func2 = func2; 140 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0); 141} 142 143int avcodec_thread_init(AVCodecContext *avctx, int thread_count) 144{ 145 int i; 146 ThreadContext *c; 147 148 avctx->thread_count = thread_count; 149 150 if (thread_count <= 1) 151 return 0; 152 153 c = av_mallocz(sizeof(ThreadContext)); 154 if (!c) 155 return -1; 156 157 c->workers = av_mallocz(sizeof(pthread_t)*thread_count); 158 if (!c->workers) { 159 av_free(c); 160 return -1; 161 } 162 163 avctx->thread_opaque = c; 164 c->current_job = 0; 165 c->job_count = 0; 166 c->job_size = 0; 167 c->done = 0; 168 pthread_cond_init(&c->current_job_cond, NULL); 169 pthread_cond_init(&c->last_job_cond, NULL); 170 pthread_mutex_init(&c->current_job_lock, NULL); 171 pthread_mutex_lock(&c->current_job_lock); 172 for (i=0; i<thread_count; i++) { 173 if(pthread_create(&c->workers[i], NULL, worker, avctx)) { 174 avctx->thread_count = i; 175 pthread_mutex_unlock(&c->current_job_lock); 176 avcodec_thread_free(avctx); 177 return -1; 178 } 179 } 180 181 avcodec_thread_park_workers(c, thread_count); 182 183 avctx->execute = avcodec_thread_execute; 184 avctx->execute2 = avcodec_thread_execute2; 185 return 0; 186} 187